- free-roaming side-scroller - retro-styled visuals - underwater setting- play as a squid finding its way through a vast ocean - avoid obstacles and hazards- move past certain roadblocks by returning to them once you have the right power-up- swim by pressing A or B - deadly red spikes from Cave Story line the game's corridors- acquire a pointy hat that allows you to break blocks and spear enemies from beneath- later power-up called the compressor enables you to make a dashing movement- level-up system that allows you to grow in power as you collect experience points- each new level you earn nets you additional maximum health and makes your attacks more powerful- encounter a room filled with experience-giving fish- a sign outside warns not to enter on pain of instant death- if you enter, the door closes behind you, blocked by spikes- due out within the next month on the eShop, with the DSiWare version following shortly thereafter- $5 asking price